EP1298794A3 - Circuit de réduction de bruit de commutation et amplificateur pour fréquences vocales - Google Patents

Circuit de réduction de bruit de commutation et amplificateur pour fréquences vocales Download PDF

Info

Publication number: EP1298794A3
Authority: EP; European Patent Office
Prior art keywords: reference voltage; reduction circuit; sound reduction; pulse width; pop sound
Prior art date: 2001-09-26
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Granted

Application number

EP02021728A

Other languages

German (de)

English (en)

Other versions

EP1298794B1 (fr

EP1298794A2 (fr

Inventor

Kenichi Intellectual Property Division Miyagaki

Kouichi Intellectual Property Division Yamashita

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Toshiba Corp

Original Assignee

Toshiba Corp

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

2001-09-26

Filing date

2002-09-25

Publication date

2003-10-22

2002-09-25 Application filed by Toshiba Corp filed Critical Toshiba Corp

2003-04-02 Publication of EP1298794A2 publication Critical patent/EP1298794A2/fr

2003-10-22 Publication of EP1298794A3 publication Critical patent/EP1298794A3/fr

2005-12-21 Application granted granted Critical

2005-12-21 Publication of EP1298794B1 publication Critical patent/EP1298794B1/fr

2022-09-25 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Links

230000003321 amplification Effects 0.000 title 1
238000003199 nucleic acid amplification method Methods 0.000 title 1
230000000295 complement effect Effects 0.000 abstract 1

Classifications

- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/217—Class D power amplifiers; Switching amplifiers
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
- H03F1/305—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters in case of switching on or off of a power supply
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/34—Muting amplifier when no signal is present
- H03G3/348—Muting in response to a mechanical action or to power supply variations, e.g. during tuning; Click removal circuits

Landscapes

Engineering & Computer Science (AREA)
Power Engineering (AREA)
Amplifiers (AREA)
Noise Elimination (AREA)
Circuit For Audible Band Transducer (AREA)

EP02021728A 2001-09-26 2002-09-25 Circuit de réduction de bruit de commutation et amplificateur pour fréquences vocales Expired - Lifetime EP1298794B1 (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
JP2001295094		2001-09-26
JP2001295094A JP2003110441A (ja)	2001-09-26	2001-09-26	ポップ音低減回路及び音声出力増幅装置

Publications (3)

Publication Number	Publication Date
EP1298794A2 EP1298794A2 (fr)	2003-04-02
EP1298794A3 true EP1298794A3 (fr)	2003-10-22
EP1298794B1 EP1298794B1 (fr)	2005-12-21

Family

ID=19116587

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP02021728A Expired - Lifetime EP1298794B1 (fr)	2001-09-26	2002-09-25	Circuit de réduction de bruit de commutation et amplificateur pour fréquences vocales

Country Status (5)

Country	Link
US (1)	US7142048B2 (fr)
EP (1)	EP1298794B1 (fr)
JP (1)	JP2003110441A (fr)
CN (1)	CN1237708C (fr)
DE (1)	DE60208137T2 (fr)

Families Citing this family (28)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
JP2004229203A (ja) *	2003-01-27	2004-08-12	Ricoh Co Ltd	半導体集積回路および該半導体集積回路を用いた音響素子ドライブアンプ
US20040151329A1 (en) *	2003-01-30	2004-08-05	Rupinder Judge	Prevention of audio pop in a digital audio device
KR100604815B1 (ko)	2003-05-02	2006-07-26	삼성전자주식회사	신호 발생장치 및 신호 발생방법
US8179345B2 (en) *	2003-12-17	2012-05-15	Samsung Electronics Co., Ltd.	Shared buffer display panel drive methods and systems
US8144100B2 (en)	2003-12-17	2012-03-27	Samsung Electronics Co., Ltd.	Shared buffer display panel drive methods and systems
CN100514842C (zh) *	2004-04-21	2009-07-15	罗姆股份有限公司	信号输出电路、使用其的音频信号输出装置、电子设备
KR100598366B1 (ko) *	2005-04-06	2006-07-06	주식회사 팬택	팝노이즈 출력 제거가 가능한 전자기기 및 팝노이즈 출력제거 회로
KR100565103B1 (ko) *	2005-05-10	2006-03-30	(주)유비아이사운드	스위칭 증폭기에서의 출력 펄스 폭 변조 방법 및 그 장치
TW200711257A (en) *	2005-09-02	2007-03-16	Princeton Technology Corp	Charging circuit, integrated circuit and control method
JP2007151098A (ja) *	2005-11-07	2007-06-14	Matsushita Electric Ind Co Ltd	ポップ音を抑止した音声信号出力制御装置
JP2007235409A (ja)	2006-02-28	2007-09-13	Fujitsu Ten Ltd	音響信号生成装置
GB2440188B (en) *	2006-07-14	2011-06-08	Wolfson Ltd	Amplifier Circuits, Methods of Starting and Stopping Amplifier Circuits
GB2441362B (en) *	2006-08-31	2011-09-21	Wolfson Microelectronics Plc	Amplifier apparatus and method
JP4290721B2 (ja) *	2006-11-15	2009-07-08	シャープ株式会社	バンドパスフィルタ回路、並びに赤外線信号処理回路
US8232678B2 (en) *	2006-12-15	2012-07-31	Bang & Olufsen Icepower A/S	Extra power stage added for pop elimination
TWI325225B (en) *	2006-12-19	2010-05-21	Qisda Corp	Audio signal output circuit capable of decreasing pop noise
JP4316606B2 (ja)	2006-12-22	2009-08-19	日本テキサス・インスツルメンツ株式会社	電圧供給回路及び回路装置
CN101409543B (zh) *	2007-10-10	2011-07-20	义隆电子股份有限公司	多电平脉冲宽度调制方法
TWM332340U (en) *	2007-12-04	2008-05-11	Princeton Technology Corp	Audio playing system
US9014396B2 (en) *	2008-01-31	2015-04-21	Qualcomm Incorporated	System and method of reducing click and pop noise in audio playback devices
JP5018795B2 (ja) *	2009-01-22	2012-09-05	日本テキサス・インスツルメンツ株式会社	電圧供給回路及び回路装置
CN101511046B (zh) *	2009-02-24	2013-10-09	华为终端有限公司	一种能消除爆音的音频播放设备和方法
US8228117B2 (en) *	2009-07-15	2012-07-24	Freescale Semiconductor, Inc.	Quiet power up and power down of closed loop digital PWM modulators
TWI531153B (zh) *	2012-03-29	2016-04-21	微晶片科技公司	音訊放大裝置
TWI543638B (zh) *	2014-01-28	2016-07-21	宏達國際電子股份有限公司	聲音產生系統和其音頻放大的方法
KR20160068562A (ko) *	2014-12-05	2016-06-15	에스케이하이닉스 주식회사	증폭 성능을 향상시킬 수 있는 버퍼 회로
JP7273484B2 (ja)	2018-11-16	2023-05-15	株式会社東芝	信号生成回路
CN115132163B (zh) *	2022-06-22	2023-07-11	锐宸微(上海)科技有限公司	音频播放装置与其启用方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4458208A (en) *	1981-04-10	1984-07-03	Sony Corporation	Pulse width modulated signal amplifier
EP0817371A1 (fr) *	1996-06-27	1998-01-07	Harris Corporation	Amplificateur classe D sans bruit de claquement à la mise sous tension
EP1049247A1 (fr) *	1999-04-27	2000-11-02	STMicroelectronics S.r.l.	Amplificateur classe D à grande largeur de bande
US20010013808A1 (en) *	2000-02-14	2001-08-16	Masanori Fujisawa	Mute circuit and digital audio amplifier circuit

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US6016075A (en) *	1997-06-04	2000-01-18	Lord Corporation	Class-D amplifier input structure
CN1258393A (zh) *	1998-01-22	2000-06-28	皇家菲利浦电子有限公司	Pwm放大器
JP2001223536A (ja)	2000-02-14	2001-08-17	Rohm Co Ltd	ミュート回路およびデジタルオーディオ増幅回路
JP3814118B2 (ja)	2000-02-28	2006-08-23	ローム株式会社	ミュート回路およびオーディオ増幅回路

2001
- 2001-09-26 JP JP2001295094A patent/JP2003110441A/ja not_active Withdrawn
2002
- 2002-09-25 US US10/253,864 patent/US7142048B2/en not_active Expired - Fee Related
- 2002-09-25 EP EP02021728A patent/EP1298794B1/fr not_active Expired - Lifetime
- 2002-09-25 DE DE60208137T patent/DE60208137T2/de not_active Expired - Fee Related
- 2002-09-26 CN CNB021498814A patent/CN1237708C/zh not_active Expired - Fee Related

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4458208A (en) *	1981-04-10	1984-07-03	Sony Corporation	Pulse width modulated signal amplifier
EP0817371A1 (fr) *	1996-06-27	1998-01-07	Harris Corporation	Amplificateur classe D sans bruit de claquement à la mise sous tension
EP1049247A1 (fr) *	1999-04-27	2000-11-02	STMicroelectronics S.r.l.	Amplificateur classe D à grande largeur de bande
US20010013808A1 (en) *	2000-02-14	2001-08-16	Masanori Fujisawa	Mute circuit and digital audio amplifier circuit

Also Published As

Publication number	Publication date
DE60208137T2 (de)	2006-08-31
JP2003110441A (ja)	2003-04-11
US7142048B2 (en)	2006-11-28
EP1298794B1 (fr)	2005-12-21
EP1298794A2 (fr)	2003-04-02
CN1420624A (zh)	2003-05-28
US20030058040A1 (en)	2003-03-27
DE60208137D1 (de)	2006-01-26
CN1237708C (zh)	2006-01-18

Legal Events

Date	Code	Title	Description
2003-02-15	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
2003-04-02	17P	Request for examination filed	Effective date: 20020925
2003-04-02	AK	Designated contracting states	Kind code of ref document: A2 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
2003-04-02	AX	Request for extension of the european patent	Extension state: AL LT LV MK RO SI
2003-06-11	RIN1	Information on inventor provided before grant (corrected)	Inventor name: YAMASHITA, KOUICHI,INTELLECTUAL PROPERTY DIVISION Inventor name: MIYAGAKI, KENICHI,INTELLECTUAL PROPERTY DIVISION
2003-09-05	PUAL	Search report despatched	Free format text: ORIGINAL CODE: 0009013
2003-10-22	AK	Designated contracting states	Kind code of ref document: A3 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
2003-10-22	AX	Request for extension of the european patent	Extension state: AL LT LV MK RO SI
2004-07-14	AKX	Designation fees paid	Designated state(s): DE FR
2004-09-22	17Q	First examination report despatched	Effective date: 20040316
2005-06-15	GRAP	Despatch of communication of intention to grant a patent	Free format text: ORIGINAL CODE: EPIDOSNIGR1
2005-07-01	GRAS	Grant fee paid	Free format text: ORIGINAL CODE: EPIDOSNIGR3
2005-11-04	GRAA	(expected) grant	Free format text: ORIGINAL CODE: 0009210
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2006-11-29	26N	No opposition filed	Effective date: 20060922
2008-11-28	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: FR Payment date: 20080915 Year of fee payment: 7
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Publication	Publication Date	Title
EP1298794A3 (fr)	2003-10-22	Circuit de réduction de bruit de commutation et amplificateur pour fréquences vocales
WO2001063745A3 (fr)	2002-10-24	Amplificateur de commutation
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